Pll Alignment - Vertex Standard VX-1700 Series Service Manual

Alignment
Whenever possible, alignments should be made with
oscillator shields and circuit boards firmly affixed
in place. Also, the test equipment must be thoroughly
warmed up before beginning.
Note: Signal levels in dB referred to in the alignment
procedure are based on 0dBµ = 0.5µV.
Set up the test equipment as shown below, and ap-
ply 13.8V DC power to the transceiver.
The VX-1700 must be programmed for use in the
intended system before alignment is attempted. The
frequency and other parameters are loaded from the
file during the alignment process.
In order to facilitate alignment over the complete
operating range of the equipment, it is recommend-
ed that the channel data first be uploaded and then
stored to disk. Alignment Channel data should then
be downloaded. The original data can be replaced at
the end of the alignment process.
50-ohm
Dummy Load
RF Sampling
Coupler
Inline
Wattmeter
Frequency
Counter
12
RF
Signal Generator
ANT
Transceiver
TUNER INPUT
Power Supply
13.8 VDC
CT-62
Programming Cable
COM Port
CE77 Programming Software
Reference & Local Alignment
PLL R F
EFERENCE REQUENCY
Connect the Frequency Counter to pin 4 of Q1062
(Lot. 1~6) or TP1073 (Lot. 7~) on the MAIN Unit.
Adjust X1003 on the MAIN Unit (Lot. 1~6) or
Trimmer on the REF Unit (Lot. 7~) for 22.625 MHz
±10 Hz on the frequency Counter.
2 L O L
ND OCAL UTPUT EVEL
Connect the RF millivoltmeter to TP1043 on the
MAIN Unit.
Adjust T1013 on the MAIN Unit for 160 mVrms
(±50 mVrms) on the RF millivoltmeter.

PLL Alignment

VCO VCV A
LIGNMENT
Connect the DC voltmeter to TP1048 on the MAIN
Unit, and referring to the Table below, switch the
transceiver to each channel listed. Then adjust the
listed component for the required voltage or confirm
that the correct voltage is present.
Tune to Adjust or Confirm
13.499 MHz Adjust T1066
0.100 MHz Confirm
29.999 MHz Adjust T1067
13.5000 MHz Confirm
PLL O L
UTPUT EVEL
Connect the RF millivoltmeter to TP1039 on the
MAIN Unit, then tune the radio to 7.500 MHz.
Confirm that the output level is more than 10
dBm.
A
LIGNMENT
For
5.2 V ± 0.1 V
More than 0.6 V
5.3 V ± 0.1 V
More than 0.5 V